CVE-2026-91947

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

FreeRDP server versions before 3.31.0 contain a use-after-free vulnerability in the DRDYNVC parser that dereferences a channel pointer after releasing the synchronization lock. Authenticated clients can race AUDIN channel closure messages against DRDYNVC data parsing to trigger heap-use-after-free when accessing freed channel objects.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
Patch available. Sources: github.
generic

FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC | Advisories | VulnCheck

https://www.vulncheck.com/advisories/freerdp-server-before-3.31.0-use-after-free-via-drdynvc
github Patch Available

FreeRDP server DRDYNVC parser use-after-free during concurrent channel close · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6mpx-c8rj-whj5

Vendor Advisories for CVE-2026-91947(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 29× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 18:49 UTCGHSA enrichment
  3. 2026-09-20 07:57 UTCGHSA enrichment
  4. 2026-09-19 20:58 UTCEG score recompute
  5. 2026-09-19 20:58 UTCGHSA enrichment
  6. 2026-09-19 10:06 UTCGHSA enrichment
  7. 2026-09-18 23:14 UTCEG score recompute
  8. 2026-09-18 23:14 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 12:23 UTCGHSA enrichment
  11. 2026-09-18 01:31 UTCEG score recompute
  12. 2026-09-18 01:31 UTCGHSA enrichment
  13. 2026-09-17 19:32 UTCEPSS rescore
  14. 2026-09-17 14:39 UTCGHSA enrichment
  15. 2026-09-17 03:47 UTCGHSA enrichment
  16. 2026-09-16 16:55 UTCEG score recompute
  17. 2026-09-16 16:55 UTCGHSA enrichment
  18. 2026-09-16 15:50 UTCEG score recompute
  19. 2026-09-16 15:50 UTCGHSA enrichment
  20. 2026-09-16 15:12 UTCEG score recompute
  21. 2026-09-16 15:12 UTCGHSA enrichment
  22. 2026-09-16 14:09 UTCEPSS rescore
  23. 2026-09-16 04:20 UTCEG score recompute
  24. 2026-09-16 04:20 UTCGHSA enrichment
  25. 2026-09-16 03:25 UTCEG score recompute
Show 4 more
  1. 2026-09-16 03:25 UTCGHSA enrichment
  2. 2026-09-15 16:33 UTCEG score recompute
  3. 2026-09-15 15:24 UTCEG score recompute
  4. 2026-09-15 15:22 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91947?
CVE-2026-91947 is a high vulnerability published on September 15, 2026. FreeRDP server versions before 3.31.0 contain a use-after-free vulnerability in the DRDYNVC parser that dereferences a channel pointer after releasing the synchronization lock. Authenticated clients can race AUDIN channel closure messages against DRDYNVC data parsing to trigger heap-use-after-free…
When was CVE-2026-91947 disclosed?
CVE-2026-91947 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91947 actively exploited?
CVE-2026-91947 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 77.1% of all scored CVEs.
What is the CVSS score of CVE-2026-91947?
CVE-2026-91947 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-91947?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91947, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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